DescriptionFOSSIL SEED FERN PLATE
Late Carboniferous, Pennsylvanian subperiod
Llewellyn Formation, St Claire, Schuylkill Co., Pennsylvania, USA
The seed ferns of Pennsylvania were instrumental in establishing the Carboniferous timeline of North America, their local abundance suggesting the name of the Pennsylvanian subperiod. Preserved in incredibly fragile shale, they are a fossil hound's nightmare to remove, but their superb appearance makes the effort worthwhile. This is a particularly fine, thin plate, 9¼ x 6¼ inches, by up to ⅜ inch thick. The fossils are highlighted with the characterful coating of white Pyrophyllite (the phyllosillicate mineral used in tailor's chalk). The patterns of the various fern genera leap in dramatic contrast from the dark gray shale, making for a rare, highly aesthetic, and extremely old fossil.
Condition report available upon request.
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